GCC，字符串和内联GLSL？ [英] GCC, stringification, and inline GLSL?

问题描述

我想使用宏字符串来声明GLSL着色器字符串：

I'd like to declare GLSL shader strings inline using macro stringification:

#define STRINGIFY(A)  #A
const GLchar* vert = STRINGIFY(
#version 120\n
attribute vec2 position;
void main()
{
    gl_Position = vec4( position, 0.0, 1.0 );
}
);

这使用VS2010构建并运行良好，但无法在 gcc 与：

This builds and runs fine using VS2010 but fails to compile on gcc with:

error: invalid preprocessing directive #version

有没有办法以可移植的方式使用这样的字符串？

Is there a way to use stringification like this in a portable manner?

我试图避免每行引号：

const GLchar* vert = 
"#version 120\n"
"attribute vec2 position;"
"void main()"
"{"
"    gl_Position = vec4( position, 0.0, 1.0 );"
"}"
;

...和/或换行符：

...and/or line continuation:

const GLchar* vert = "\
#version 120\n                                 \
attribute vec2 position;                       \
void main()                                    \
{                                              \
    gl_Position = vec4( position, 0.0, 1.0 );  \
}                                              \
";

推荐答案

是未定义的，所以你不能这样做直接。但是，只要没有任何一个着色器需要 #version 之外的预处理器指令，就可以这样做：

Unfortunately, having preprocessor directives in the argument of a macro is undefined, so you can't do this directly. But as long as none of your shaders need preprocessor directives other than #version, you could do something like:

#define GLSL(version, shader)  "#version " #version "\n" #shader

const GLchar* vert = GLSL(120,
    attribute vec2 position;
    void main()
    {
        gl_Position = vec4( position, 0.0, 1.0 );
    }
);

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